Shear strengths of joints with roughened concrete surfaces and post-installed dowel bars subjected to normal and shear stresses for seismically retrofitted structures

Takase, Yuya; Yamada, Taizo

doi:10.1016/j.istruc.2022.09.069

Cited by 2 publications

(13 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this study, previous test results (Takase and Yamada 2022) were used for comparison with the proposed model results. This section briefly explains the shear loading tests.…”

Section: Shear Loading Testmentioning

confidence: 99%

“…Figure 4 shows the failure modes. As mentioned in the previous papers (Isozaki et al 2018;Takase and Yamada 2022), the failure mode of the roughened surface can be classified as bearing and shear failures. The sides of the uneven surfaces are vertically damaged in the bearing failure, as shown in Fig.…”

Section: Failure Modementioning

confidence: 99%

“…It is obtained from the average stress with δ = 2-6 mm for specimens with r N = 0.00. Furthermore, the authors proposed a shear strength formula in a previous study (Takase and Yamada 2022). The uneven surface was regarded as a cone.…”

Section: Envelope Curve Of the Roughened Surfacementioning

confidence: 99%

“…A roughened surface and post-installed dowel bar were applied to interfaces. Generally, for the seismic retrofitting of existing buildings, concrete surfaces are roughened using a vibration hammer (Takase and Yamada 2022). Figure 1 illustrates an example of an interface for seismically retrofitted RC buildings.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, for structural designs of seismic retrofitted structures, envelope and cyclic models for interfaces are useful. In the previous study (Takase and Yamada 2022), the interface specimens were subjected to shear and normal loads. Moreover, a shear strength expression was proposed.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Cyclic Behavior of Interfaces for Seismically Retrofitted RC Buildings

Yamada

Takase

Abe

2023

ACT

Self Cite

View full text Add to dashboard Cite

In seismically retrofitted reinforced concrete (RC) structures, new members are connected to existing members using interfaces with roughened surfaces and post-installed dowel bars. During an earthquake, the interfaces are subjected to cyclic shear and normal stresses. Therefore, the structural design of interfaces is essential. In a previous study, normal and shear loads were applied to interface specimens. Moreover, a shear strength estimation method was proposed; however, the cyclic behavior was not discussed. This paper presents a cyclic model of the roughened surface in retrofitted RC structures. First, an envelope model was constructed using the previous shear strength estimation method and Saenz model, a constitutive law of concrete. Subsequently, the cyclic rules were modeled. Moreover, a previous dowel model was incorporated into the proposed cyclic model to estimate the test results. Finally, the proposed model provided reasonably estimated test results; the average ratio of the test results to the model results was 1.04. In addition, as δ increased, the effect of the dowel bar intensified in terms of shear.

show abstract

“…In this study, previous test results (Takase and Yamada 2022) were used for comparison with the proposed model results. This section briefly explains the shear loading tests.…”

Section: Shear Loading Testmentioning

confidence: 99%

Section: Failure Modementioning

confidence: 99%

Section: Envelope Curve Of the Roughened Surfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Cyclic Behavior of Interfaces for Seismically Retrofitted RC Buildings

Yamada

Takase

Abe

2023

ACT

Self Cite

View full text Add to dashboard Cite

show abstract

Modified Cyclic Model Of Interfaces With Roughened Surface And Dowel Bar Subjected To Normal And Shear Stresses

Takase,

Yamada,

Abe

2023

Proceedings of the 11th International Conference on Fracture Mechanics of Concrete and Concrete Structures

View full text Add to dashboard Cite

When reinforced concrete (RC) buildings are seismically retrofitted, new members are attached to existing members through interfaces with roughened surfaces using vibratory hammer and post-installed dowel bars. To attach extended members to the outside of an existing frame, the interfaces are subjected to bending moments and shear forces. In other words, interfaces are subjected to the compressive or tensile normal stresses in addition to shear stresses. However, the previous literature is limited in its investigation of the behaviors under such combined stresses. Therefore, in the authors' previous study, the shear strength estimation of the interfaces was proposed; and then, the cyclic model was presented. Although the proposed model can be applied to the interfaces subjected to tensile and shear stresses, the behavior under compressive normal stress was not discussed. Hence, in this study, the model was improved to estimate the cyclic behavior under the different normal stresses. The Saenz model, which is a constitutive law of concrete, was used to evaluate the envelope behavior. In addition, the peak stress was calculated by using the proposed estimation. For the compressive normal stress, the envelope model and peak stress were modified. Subsequently, the proposed cyclic rules were applied; and, a previous dowel model was incorporated into the modified model. The concrete compressive strength was set to 20-23 N/mm 2 , the diameters of the anchor bar were 13, 16, and 19 mm, the compressive normal stress was set to -0.48 N/mm 2 , and the tensile ratio rN was set to 0.00, 0.33, and 0.66. Epoxy adhesive was used. As a result, the modified model agreed well with the test results; the average ratio of the test results to the model results was 0.91-1.12. In addition, with the increase of δ, the effect of the dowel bar was intensified; whereas, under the compressive normal stress, it became insignificant. Finally, it was concluded that the modified model could reasonably estimate the behavior under the various stresses.

show abstract

Shear strengths of joints with roughened concrete surfaces and post-installed dowel bars subjected to normal and shear stresses for seismically retrofitted structures

Cited by 2 publications

References 16 publications

Cyclic Behavior of Interfaces for Seismically Retrofitted RC Buildings

Cyclic Behavior of Interfaces for Seismically Retrofitted RC Buildings

Modified Cyclic Model Of Interfaces With Roughened Surface And Dowel Bar Subjected To Normal And Shear Stresses

Contact Info

Product

Resources

About